Bible Verses About Communion With God: Holiness essential to

Become not yoked with others--unbelievers, for what partaking is there to righteousness and lawlessness?

and what fellowship to light with darkness? and what concord to Christ with Belial? or what part to a believer with an unbeliever?

and what agreement to the sanctuary of God with idols? for ye are a sanctuary of the living God, according as God said--`I will dwell in them, and will walk among them , and I will be their God, and they shall be My people,